I thought I'd post here for once, because my experience was different... I tried all the cleaning tricks after all the other battery troubleshooting, and still no green light. At all. Just quit, went dormant or something. I decided to delete the mouse from my Windows o/s, and just put the mouse aside; kind of clicked it and checked the light several times a day, nothing. Then, three DAYS later, I checked again and the green light came on, once. Baffled, I decided to re-pair to my o/s, clicked and clicked, and voila! It started working again. Perfectly. Perhaps it just needed a vacation! It's a very heavily used mouse, first generation Magic Mouse. Baffling.